Transformer Change--Over Board - Bosch PSU 5000 Series Instructions For Assembly And Operation Manual

9.8 Transformer change- -over board
1070 078 224--- 109
PSU 5000 / PSG 3000
Instructions for Assembly and Operation
The PSU 5100.XXX, PSU 5200.XXX and PSU 5300.XXX inverter types are
equipped with an additional slot for a transformer change--over board. This slot is
concealed by a dummy cover.
The transformer change--over board serves for the external selection of the con-
nected medium--frequency rectifier unit.
Change--over is by means of a 24 V signal (e.g. from a PLC or robot control with
automatic electrode gun change).
When a transformer selection has been made via the change--over board, the func-
tions of switch S1/1 to 7 are not operative.
As an additional function, the change--over board supplies the "maximum pulse
width reached" signal (feedback message to external control unit: e.g. electrode
gun not closed) via a floating contact.
In contrast to the decimal point of the seven--segment display, the signal remains
high until the next weld time and does not produce an inverter fault.
Possible causes:
` no transformer
` mains voltage too low
` excessive power demand on transformer
` secondary welding circuit open
Transformer change- - over board TK 5101 / TK 5301
X2
1
2
3
4
5
6
7
8
Adjustment
functions
+24 V I/O
PSG 3100.00 A
PSG 3075.10 A
PSG 3050.00 A
PSG 3050.10 A
not used
not used
GND I/O
9--5